hey guys i just got a used 08 yz450f this week. what do i need to know. already started tearing it apart what should i look for besides the basics? i think i might pull the head but im not sure it suppose to be a low hour bike according the hour meter. man these things make the 250 two stroke feel gut less this was my first time riding a 450 not sure if im going to keep it though i might just stick to my yz250f where the power is alot more mellow.